I think the key here is persistence and patience, I had a really frustrating time getting my first successful WILD (Which was the second technique I used, and is now pretty much the only technique I use) I just stuck at it and really gave it a good crack, try not to get fed up or frustrated. I personally have no experience with supplements and do not favour them a great deal, so I'd be little help on that front.

As for your frustration with the time it's taking to get into the WILD I'd probably try using a fan or another sound to concentrate on, it doesn't have to be anything special, but I found a fan worked best. Smack it on and leave it far enough away to keep it from being annoying but make the sound audible, then just WILD as you normally would, focus on the sound of the fan, really attempt to dissect every part of the sound as best you can, use it as your anchor.

Good luck and best wishes!